add rscons and Rsconscript

.gitignore

@@ -0,0 +1,3 @@
+/build/
+/.rscons*
+/dwscr

Rsconscript

@@ -0,0 +1,35 @@
+configure do
+  unless File.exists?("wfobj/WFObj.cc")
+    $stderr.puts "git submodules appear to be missing. Run `git submodule update --init`."
+    exit 1
+  end
+  if RUBY_PLATFORM =~ /mingw/
+    check_lib "opengl32"
+    check_lib "glu32"
+    check_lib "mingw32"
+  else
+    check_lib "X11"
+    check_lib "GL"
+    check_lib "GLU"
+  end
+  check_lib "ode"
+  check_cfg program: "sdl-config"
+end
+
+build do
+  Environment.new do |env|
+    system("make -C LoadFile")
+    env["CCFLAGS"] = %w[-O2 -Wall]
+    env["CPPPATH"] += %w[.]
+    sources = ["dwscr.cc", "wfobj/WFObj.cc", "LoadFile/LoadFile.cc"] + glob("ss/*.{cc,cpp}")
+    if RUBY_PLATFORM =~ /mingw/
+      sources += ["displayinfo-win32.cc"]
+    else
+      sources += ["displayinfo.cc"]
+    end
+    dwscr = env.Program("dwscr", sources)
+    if RUBY_PLATFORM =~ /mingw/
+      env.Install("C:/Windows/dwscr.scr", dwscr)
+    end
+  end
+end